Device for shaping material to the arc of any desired circle



(No Model.) 2 SheetsSheet 1.

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DEVIGE EOE SHAPING MATERIAL TO THE ARO 0]? ANY DESIRED CIRCLE. No.399,675. Patented Mar. 19, 1889.

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DEVICE FOR SHAPING MATERIAL TO THE ARO OF ANY DESIRED GIROLE. No.399.675. Patented Mar. 19, 1889.

INVENTDH.

llniTnn .iSTnTTEs lRnTnivT @FMQE PULASKI LEEDS, OF LOUISVILLE, ASSIGNORTO B. T. MILLER, OF COVINGTON,

KENTUCKY.

DEVICE FOR SHAPING MATERIAL TO THE ARC OF ANY DESIRED CIRCLE.

SPECIFICATION forming part of Letters Patent No. 399,675, dated March19, 1889.

Application filed November 22, 1888. Serial No. 291,612. (No model.)

To all whom it may concern:

Be it known that I, PULASKI LEEDS, a citizen of the United States,residing at Louis- I ville, State of Kentucky, have invented certain newand usefulImprovements in Devices for Shaping Material to the Arc of anyDesired Circle, of which the following is a specification, referencebeing had to the accompanying drawings.

This invention, here shown, consists of a device for slottinglocomotive-links intended to be used in connection with a drill press,the object being to hold the work securely under the boring-tool andapplying it to the tool with such a motion as to mark out or cut anydesired circular arc.

Figure 1 shows the device in elevation with a link in position to beoperated upon. Fig. 2 is a plan of the same with link dotted. Fig. 3 isa partial plan with templet y and feedscrew 70. Fig. dis a sectionthrough line :0 50, Fig. 8. Fig. 5 is a partial longitudinal sectionthrough center of slot 2), Fig. 1.

The device consists, first, of two bed-plates, a and a, connected by ahinge'joint j, and having a lateral movement, so that they may be placedat any desired angle with each other, being slotted on the upper sidecentrally and longitudinally, as seen at band I), and having the sidesparallel with the slots; second, two carrier-blocks, c and 0', working,respectively, in the slots 1) and b of the bed plates a and a, and eachhaving a perpendicular pin or stud, d d, slotted, as shown at c, Fig. 4,to receive a key, as shown at c, Fig. 5; third, a husk-box,f, resting onthe bedplates at a, fitting on the studs cl d, secured by keys, as shownat 6, Fig.6, and furnished with screws g and h and straps i, for holdingthe piece on to be slotted. It is also slotted to allow the escape ofcuttings through the opening 1) in the bed-plates.

so no and z 2 are slight elevations on the floor of the husk-box, onwhich the link on rests while being operated upon.

The screw it is a prolongation of the handle h, for convenience ofhandling the device, as shown in Figs. 1 and 5. A feed-screw, 76, isattached to one of the carriers c and operated by a hand-wheel, Z, bywhich motion is given to the husk-box f containing the piece m to beslotted.

Operation: The device is placed. upon a drill-press with the center ofthe hinge-joint directly under the boring-tool n and secured at theproper angle. The piece to be slotted is placed on the husk-box f andsecured by the screws g and h and the straps 2'. By op erating the screwk the husk-box f moves in such a manner as to cause the tool 42, placedin a line bisecting the angle formed by the two slots b and b, to cutout a circular are upon the piece of work to be slotted.

It is obvious that the device may be so set as to describe arcs of thedesired magnitude cutting at any desired point on the line bisecting theangle formed by the two slots 1) and b. r This movement of the husk-boxand the piece to be slotted may eitherbe continuous while the tool iscutting, ormay be used intermittently to set the work for a series ofcuttings which will all lie in the same arc, thus enabling the operatorto work out the desired slot.

It is obvious that the degree of curvature of the are cut will dependupon the angle at which the two bed-plates are set. The radius of thedesired curve having been determined, the bed-plates can be best set forit by placing inthe angle formed by their edges a tem- 8o plet in theform of an isosceles triangle, as shown at y, Fig. 3,half,r s, of whosebase will be the sine, and whose altitude 25 s will be the versed sineof the corresponding arc.

Having thus described my invention, the

following is what I claim as new therein and desire to secure by LettersPatent:

1. In a slot-cutting device, the combination of the hinged bed-plates,carriers adapted to slide in said slots formed in said bed-plates,

with the carriers adapted to move in said slots 5 of the bed-plates andcarrying the husk-box, and means for regulating the movement of saidcarriers, substantially as described.

The combination of the bed-plates a a,

hinged and slotted, as described, the carriers IOO 0 c, furnished withstuds 01 d, and a husk-box pivoted upon said studs and carrying theblank to be operated upon, substantially as described.

5 4E. The herein-described device for cutting slots, consisting of thefollowing elements: bed-plates a a, hinged and slotted, as described,having perforations 19 near the hingejoint, carrier 0 c, husk-box f,secured to the IO carriers by means of studs 61 d, means for producingmovement to carriers 6 c, and means, substantially as described, forsecuring the blank to be slotted into the husk-box.

The foregoing specification of my invention signed by me this 27th dayof Oetober,-A. D. 15 1888.

PULASKI LEEDS.

Witnesses:

P. J. OADWALLADER, J EPTHA GARRARD.

